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In ascomycetes that build their asci inside flask-like structures called perithecia or pseudothecia, the asci take turns snaking to the little opening, poking themselves out, and firing.

Epichloë, which clothes the sheaths and halms of grasses with its stroma, at first snowy white and later ochre-yellow as the perithecia form, is another example.

Stroma, strō′ma, n. the subtentacular tissue or substance of an organ or cell: in fungi, the substance in which the perithecia are immersed: the solid mass left after all liquid is expressed from protoplasm.—adjs.

Various types of ascocarp are characteristic of the different divisions of the Carpoascomycetes: the cleistothecium, apothecium and perithecium.

Example, Common Puff Ball.Coniomycetes, in which the spores are naked, mostly terminal on inconspicuous threads, free or enclosed in a perithecium.